Occurrence of carbon nanotubes and implication for the siting of elements in selected anthracites

Luis F.O. Silva, Tito J. Crissien, Carlos H. Sampaio, James C. Hower, Shifeng Dai

Research output: Contribution to journalArticlepeer-review

32 Scopus citations

Abstract

Petrographic, geochemical, and electron microbeam investigations of selected anthracites and anthracite-rank coaly shales were conducted. The Pennsylvania, Rhode Island, and KwaZu-Natal anthracites show an enrichment in the middle to heavy rare earths (REE) while the Virginia semi-anthracite exhibited a decreasing trend through the light REE, a peak in Gd, and a depletion in the heavy REE. Substitution of As, Hg, and Se in pyrite was most apparent in the Virginia coal. The Pennsylvania, Rhode Island, and KwaZu-Natal anthracites contained spherical carbon nanotube (CNT) structures. The CNTs contained several elements, including Hg, Cd, F, Cl, and Br. While CNTs are known to be produced from coals of varying ranks, this seems to be the first report of naturally occurring CNTs.

Original languageEnglish
Article number116740
JournalFuel
Volume263
DOIs
StatePublished - Mar 1 2020

Bibliographical note

Publisher Copyright:
© 2019 Elsevier Ltd

Keywords

  • Carbon nanotubes
  • Coal rank
  • Mercury
  • Rare earth elements

ASJC Scopus subject areas

  • General Chemical Engineering
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Organic Chemistry

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